Special Options

French Republican

Leap year calculations in the French Republican calendar are a matter of dispute. By default, convertdate calculates leap years using the autumnal equinox. You can also use one of three more systematic methods proposed over the years.

Romme, a co-creator of the calendar, proposed leap years in years divisible by four, except for years divisible by 100.

Some concordances were drawn up in the 19th century that gave leap years every 4 years, in years that give a remainder of three when divided by four (19, 23, 27, etc…).

Von Mädler proposed leap years in years divisible by four, except for years divisible by 128.

You can specify any of these three methods with the method keyword argument in french_republican conversion functions.